Boiler-flue



(No Model.)

H. L. TROUT= BOILER FLUE. No. 254,731. Patented Mar. 7,1882.

,2. a 7 z 7"- e 7714 Z WITNESSES: INVENTOR v M f ATTORNEYS,

. N. PETERS. PhnkwLillIognpMr. Wnshinginn, D. c.

UNITED STATES PATENT OFFICE,

HORACE L. TROUT, OF TROUTSVILLE, VIRGINIA.

BOILER-FLU E.

SPECIFICATION forming part of Letters Patent No. 254,731, dated March '7, 1882.

7 Application filed December 8, 1881. (No model.)

To all whom it may concern Be it known that I, HORACE L. TROUT, of Troutsville, in the county of Botetourt and State of Virginia, have invented a new and Im proved Boiler-Flue; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a side elevation of a boiler, partly broken away, showing my improved flue-tube.

as applied. Fig. 2 is an elevation of a fluetnbe, partly in section.

My invention relates to improvements in boiler-flues; and it consists in the peculiar means, hereinafter described, of attaching the ends of the boiler-flues to the flue-sheets.

In the accompanying drawings, a a represent the fluesheetsof a boiler of the usual construction, each provided with a series of opposite circular orifices or holes, b b, threaded on their peripheries, as shown at 0.

cl represents one of the flues for the passage of the products of combustion through the boiler, and it consists of a straight pipe or tube, with thread 6 out cxteriorly on both its ends.

h h represent nuts, made of copper and threaded on their interior and exterior surfaces, the threads Z on the interior surfaces of the nuts h engaging with the threads 0 on .the exterior surface of the ends of the flue cl, and the threads m on the exterior surface of the nuts h engaging with the threads 0 of the circular orifices b in the flue-sheets a.

By this construction it will be seen that the flues are detachable and can be inserted in and secured to the flue-sheets or removed therefrom by an ordinary workman, and that the detachable flues serve also as braces to the fluesheets.

In the ordinary construction the flues arcinserted in opposite holes in the flue-plates, and the ends of the flues are spread out and bent over or riveted to the fluesheets, so that if it becomes necessary to remove a flue or flues a skilled workman must be employed. The flues also contract and expand from the different degrees of heat and cold to which they are subjected, and are liable to work loose and not act as braces to the flue-plates in the ordiuaryconstruction, as in my invention.

By the em ploymentof copper nuts a galvanic action is created between the copper nuts and the iron threads on the ends of the flues, whichprevents the iron threads from rusting, whereby their strength is impaired, and the copper nuts will not oxidize, and the ends of the tines are protected by the copper nuts surrounding them from oxidation.

1 am aware that nuts or ferrules threaded both exteriorly and interiorly, and each havin gits exterior thread engaging with the thread in an orifice in a the flue-sheet and its interior thread engaging with the thread on the end of a flue, have heretofore been. employed to secure boiler-flues to their flue-sheets, and I therefore lay no claim broadly to such construction, my invention being confined in such construction to the employment of copper nuts constructed as set forth, by means of which the nuts will not oxidize'and a galvanic action is created between the copper of the nuts and the iron of the flues and flue-sheets, whereby the iron threads of the latter are prevented from corroding; and I am also aware that copper linings have been interposed between the iron of the flue and flue sheet for the purpose of preventing oxidation or corrosion, and I therefore lay no claim to such construction, which requires the employment of a separate bushing, which I dispense with entirely.

What I claim as my invention is- The combination, with the iron fiue-sheetsa a, provided with the opposite orifices, b, threaded at c, and iron flues d, each threaded exteriorly on its ends at e, of the copper nuts h h, each threaded exteriorly and interiorly at land m, whereby the iron threads on the flues and flue-sheets are prevented from corroding by the galvanic action of the metals, substantially as described.

HORACE L. TROUT. Witnesses:

P. N. TROUT, JOHN FITZGERALD, 

